Haven't done this exact thing in a while; but…
You at least used to be able to find a simple .ical (or similar) link to the calendars (in their webUI); which you could simply force to download to your computer. Then you'd end up with a file that any semi-competent calendar app can open.
Should be the same with contacts; because it's a similar simple format underneath it all.
If you don't find anything like that you can just ping me here and I one way or another will put together some sort of guide or sumthin (perhaps not before this weekend, though).